公开(公告)号：US5132988A

公开(公告)日：1992-07-21

申请号：US622106

申请日：1990-12-03

申请人： Kevin D. Fisher ,  William L. Abbott ,  John M. Cioffi ,  Philip S. Bednarz

发明人： Kevin D. Fisher ,  William L. Abbott ,  John M. Cioffi ,  Philip S. Bednarz

IPC分类号： G11B20/10 ,  H04L25/03

CPC分类号： G11B20/10046 ,  G11B20/10009 ,  H04L25/03057

摘要： Adaptive decision feedback equalizer apparatus for processing information stored on disk or tape media or the like including a data input buffer (34), a gain acquisition circuit (42), a timing acquisition circuit (40) operative to generate timing error signals for controlling the sampling phase of the read signals input to the input buffer, a synchronizing circuit (44) for generating sync detect signals and polarity signals, an FIR filter (36) for generating linear filter output signals, register means (39), feedforward update logic (38) for adjusting the equalizer coefficient signals to develop undated coefficient signals, a dual ported RAM (50) for storing a plurality of the equalizer coefficient signals, feedback logic (48) responsive to the linear filter output signals, equalizer coefficient signals obtained from the RAM, and train data signals, and operative to compute the equalizer error signals and equalizer output signals, feedback update logic (52) for adjusting the values of the coefficient signals for input back to the RAM as update signals, steady-state timing logic (54), and a controller (46) responsive to the polarity signals and the sync detect signals and operative to generate the train data signals and mode control signals for causing the equalizer apparatus to operate in either a set-up/test mode or a run mode, whereby read signals input from a storage media are sampled, amplified and digitally processed to decode stored information bits with the result that, as compared to prior art systems, storage density may be increased and error rate decreased.

摘要翻译： 用于处理存储在磁盘或磁带介质等上的信息的自适应判决反馈均衡器装置，包括数据输入缓冲器（34），增益获取电路（42），定时获取电路（40），用于产生定时误差信号， 输入到输入缓冲器的读取信号的采样相位，用于产生同步检测信号和极性信号的同步电路（44），用于产生线性滤波器输出信号的FIR滤波器（36），寄存器装置（39），前馈更新逻辑 38），用于调整均衡器系数信号以产生未标注的系数信号;双端口RAM（50），用于存储多个均衡器系数信号，响应于线性滤波器输出信号的反馈逻辑（48），从 RAM和训练数据信号，并且可操作以计算均衡器误差信号和均衡器输出信号，反馈更新逻辑（52）用于调整 用于作为更新信号输入到RAM的系数信号，稳态定时逻辑（54）和响应于极性信号和同步检测信号的控制器（46），并用于产生列车数据信号和模式控制信号 用于使均衡器装置在设置/测试模式或运行模式下操作，由此从存储介质输入的读取信号被采样，放大和数字处理以解码存储的信息位，结果是与之前的 艺术系统，存储密度可能会增加，错误率降低。

公开(公告)号：US06125150A

公开(公告)日：2000-09-26

申请号：US550443

申请日：1995-10-30

申请人： Richard Dale Wesel ,  John M. Cioffi

发明人： Richard Dale Wesel ,  John M. Cioffi

IPC分类号： H04L1/00 ,  H04L27/26 ,  H04L5/12

CPC分类号： H04L1/0059 ,  H04L1/0071 ,  H04L27/2602

摘要： The present invention discloses an OFDM transmission system providing a high level of performance on a variety of frequency selective channels by using a code having the characteristics of maximum PPD and maximum PECL, and a constellation having size 2.sup.n where n generally is greater than k+1, where k is the number of bits in each symbol input to the convolutional encoder. The codes are designed to allow high SNR subchannels to carry their full potential of information which is then used to compensate for information lost on low SNR subchannels.

摘要翻译： 本发明公开了一种通过使用具有最大PPD和最大PECL的特征的码和具有2n的星座，其中n通常大于k + 1的，在各种频率选择信道上提供高水​​平性能的OFDM传输系统 ，其中k是输入到卷积编码器的每个符号中的位数。 这些代码被设计为允许高SNR子信道携带其信息的全部潜能，然后将其用于补偿在低SNR子信道上丢失的信息。

公开(公告)号：US5623513A

公开(公告)日：1997-04-22

申请号：US165509

申请日：1993-12-13

申请人： Jacky S. Chow ,  John A. C. Bingham ,  Mark B. Flowers ,  John M. Cioffi

发明人： Jacky S. Chow ,  John A. C. Bingham ,  Mark B. Flowers ,  John M. Cioffi

IPC分类号： H04M1/60 ,  H04B3/23 ,  H04B14/04 ,  H04J11/00 ,  H04L27/26 ,  H04Q3/42 ,  H04L5/16 ,  H04B15/00

CPC分类号： H04L27/2647 ,  H04B14/046 ,  H04B3/23 ,  H04L27/2602 ,  H04L27/2623

摘要： A transmission system includes transmit and receive paths coupled via a hybrid circuit to a bidirectional transmission path. The transmit path includes a digital-to-analog converter (DAC) having a given range and precision. The transmit path signal is limited and truncated to this range and precision before the DAC. In one arrangement including an echo canceller coupled between the transmit and receive paths, a difference of the transmit path signal before and after limiting and truncation is used to produce an estimated echo response which is subtracted from the receive path signal. In another arrangement, all of the inputs to the echo canceller are derived from the transmit path after the limiting and truncation. Instead, or in addition, the amplitudes of transmit path signal samples can be shaped in conjunction with the limiting. The system can in particular be an ADSL transmission system using multicarrier modulation. In such a system the amplitudes of transmit path signal samples can be scaled to reduce clipping, with an indication of the scaling being transmitted to a remote receiver.

摘要翻译： 传输系统包括经由混合电路耦合到双向传输路径的发射和接收路径。 发射路径包括具有给定范围和精度的数模转换器（DAC）。 传输路径信号被限制并在DAC之前被截断到这个范围和精度。 在包括耦合在发送和接收路径之间的回波消除器的一种布置中，使用限制和截断之前和之后的发送路径信号的差异来产生从接收路径信号中减去的估计回波响应。 在另一种布置中，回波消除器的所有输入从限制和截断之后的发送路径导出。 替代地，或者另外，传输路径信号样本的幅度可以与限制一起成形。 该系统可以特别地是使用多载波调制的ADSL传输系统。 在这样一个系统中，发送路径信号样本的幅度可以被缩放以减少削波，并且缩放的指示被发送到远程接收机。

公开(公告)号：US5479447A

公开(公告)日：1995-12-26

申请号：US57301

申请日：1993-05-03

申请人： Peter S. Chow ,  John M. Cioffi

发明人： Peter S. Chow ,  John M. Cioffi

IPC分类号： H04B7/005 ,  H04L27/26 ,  H04K1/10 ,  H04L27/28

CPC分类号： H04W52/18 ,  H04L27/2604 ,  H04L5/0042 ,  H04L5/0044 ,  H04L5/0053 ,  H04L5/006

摘要： A method and apparatus for adaptive, variable bandwidth, high-speed data transmission of a multicarrier signal over digital subscriber lines wherein the initial optimal transmission bandwidth is identified based on initial signal-to-noise ratio (SNR) estimates of the orthogonal carriers of the multicarrier system. Maximum data throughput, or system performance margin, is achieved by assigning the total amount of information, or number of bits, to be transmitted in each multicarrier symbol to particular carriers through an initial bit allocation procedure, which is possibly subject to variable target bit error rates among the carriers. A transmit power mask, of any shape and level, is imposed upon the system by an initial energy allocation procedure that limits the maximum amount of power to be transmitted in each of the several carriers. Lastly, run-time adaptivity is achieved by monitoring the mean-squared-errors (MSE) of the orthogonal carriers, and the transmission bandwidth, as well as the bit allocation within the multicarrier symbol, is caused to change in real-time corresponding to changes in the channel characteristics in order to maintain optimal system performance.

摘要翻译： 一种用于通过数字用户线路进行多载波信号的自适应，可变带宽，高速数据传输的方法和装置，其中初始最优传输带宽基于信号的正交载波的初始信噪比（SNR）估计来识别 多载波系统 最大数据吞吐量或系统性能裕度是通过将初始位分配过程分配给每个多载波符号中要发送的信息总数或位数，来实现的，该初始位分配过程可能受到可变目标位错误 运营商之间的差距。 任何形状和电平的发射功率掩模通过限制在多个载波中的每一个中发射的最大功率量的初始能量分配过程而施加在系统上。 最后，通过监视正交载波的均方误差（MSE）来实现运行时适应性，并且使得多载波符号中的传输带宽以及比特分配被实时地改变为对应于 改变通道特性，以保持最佳的系统性能。

公开(公告)号：US20120051410A1

公开(公告)日：2012-03-01

申请号：US13254454

申请日：2009-03-04

申请人： Mark B. Flowers ,  Mark Mallory ,  Mark Brady ,  John M. Cioffi ,  Mehdi Mohseni

发明人： Mark B. Flowers ,  Mark Mallory ,  Mark Brady ,  John M. Cioffi ,  Mehdi Mohseni

IPC分类号： H04L25/08 ,  H04L5/16 ,  H04B17/00

CPC分类号： H04B3/32 ,  H04B1/7107 ,  H04J11/004 ,  H04L27/2647 ,  H04N7/102

摘要： A method and apparatus in a noise cancellation system that receives a noise reference signal via a noise reference signal input port, and performs at least one of procedures a and b set forth below for reducing noise in a DSL data signal transmitted on a DSL transmission line to which the noise cancellation system is coupled: a.i.) creating a noise free representation of a DSL synchronization symbol repeatedly occurring in the transmitted DSL data signal, and a.ii.) reducing the noise in the transmitted DSL data signal based on the noise free representation of the DSL synchronization symbol and the received noise reference signal, and b.i.) analyzing at least one of the received noise reference signal and the transmitted DSL data signal to identify one or more frequency bands in which to de-emphasize noise cancellation in the transmitted DSL data signal, and b.ii.) causing the noise cancellation system to de-emphasize noise cancellation in the identified one or more frequency bands of the transmitted DSL data signal, responsive to the analysis.

摘要翻译： 一种噪声消除系统中的方法和装置，其经由噪声参考信号输入端口接收噪声参考信号，并执行以下步骤a和b中的至少一个，以减少在DSL传输线路上发送的DSL数据信号中的噪声 噪声消除系统被耦合到其上：ai）创建在所发送的DSL数据信号中重复发生的DSL同步符号的无噪声表示，以及a）基于无噪声来减少发送的DSL数据信号中的噪声 DSL同步符号和接收到的噪声参考信号的表示，以及bi）分析接收到的噪声参考信号和所发送的DSL数据信号中的至少一个，以识别在所发送的DSL数据信号中去除强调噪声消除的一个或多个频带 DSL数据信号和b.ii.），使得噪声消除系统在所识别的一个或多个频带中去强调噪声消除 发送的DSL数据信号，响应于分析。

公开(公告)号：US08064325B1

公开(公告)日：2011-11-22

申请号：US10692297

申请日：2003-10-23

申请人： John M. Cioffi ,  Avneesh Agrawal

发明人： John M. Cioffi ,  Avneesh Agrawal

IPC分类号： H04J11/00

CPC分类号： H04B1/707 ,  H04B2201/70703

摘要： According to example embodiments for use in a communication system that is adapted to permit the users to transmit data simultaneously via shared frequency and spatial resources, an allocation of user transmission rates involves setting and maintaining the transmission rates of the users to at least a minimum user transmission rate to provide an expected minimum quality of communication for each of the users. These rates of the users are incrementally adjusted by iteratively changing the transmission rate of each user as a function of a resulting vector of transmit powers ensuing from the increased transmission rate, a degree of transmission-rate-allocation unfairness relative to the transmission rates of all the users, and a power-based selection criteria. With such an approach, the rates are fairly allocated without a disproportionate allocation of system bandwidth. Various embodiments are applicable to a variety of communication applications including OFDM or CDMA communication systems.

摘要翻译： 根据用于适于允许用户经由共享频率和空间资源同时发送数据的通信系统中的示例实施例，用户传输速率的分配涉及将用户的传输速率设置和维持至少至少最小用户 传输速率以为每个用户提供期望的最小通信质量。 通过根据增加的传输速率的传递功率的结果向量迭代地改变每个用户的传输速率，相对于所有传输速率的传输速率的传输速率分配不公平程度，递增地调整用户的这些速率 用户和基于电源的选择标准。 通过这种方法，速率是公平分配的，而不是不成比例地分配系统带宽。 各种实施例可应用于包括OFDM或CDMA通信系统的各种通信应用。

公开(公告)号：US07639596B2

公开(公告)日：2009-12-29

申请号：US10808771

申请日：2004-03-25

申请人： John M. Cioffi

发明人： John M. Cioffi

IPC分类号： H04J1/12

CPC分类号： H04M11/062 ,  H01L2924/00011 ,  H04B3/32 ,  H04B3/487 ,  H04L1/0002 ,  H04L1/0019 ,  H04L12/2856 ,  H04L12/2859 ,  H04L12/2874 ,  H04L12/2898 ,  H04L12/6418 ,  H04L25/0272 ,  H04L25/0278 ,  H04L27/2601 ,  H04L27/2608 ,  H04L41/0806 ,  H04L41/0853 ,  H04L41/142 ,  H04L43/00 ,  H04L43/0829 ,  H04L43/0847 ,  H04L43/0888 ,  H04L43/0894 ,  H04L43/106 ,  H04L43/16 ,  H04L2012/6478 ,  H04M3/2209 ,  H04M3/30 ,  H04M3/304 ,  H04M3/34 ,  H01L2924/01004

摘要： A DSL system includes a multiple loop segment where K loops are bonded to provide a multiple loop segment having up to (2K−1) communication channels on which transmissions are vectored. The segment may be a drop to a customer premises, an inter-pedestal link, or any other suitable part of a larger DSL system. Generally the bonded loops are relatively short, being 300 meters or less. Signal vectoring is used to increase the speed and data carrying capability of the channels. In some embodiments, an expanded frequency spectrum also can be used to increase the data carrying capability of one or more of the channels. An impedance matching circuit may be coupled to each end of the segment to provided efficient transmission of data across the segment. A controller may provide control signals used to operate the segment as a vectored system and, if desired, frequency bandwidth control signals. The controller may monitor and/or collect data and information from the DSL system to assist in generating control signals. The controller can be a dynamic spectrum manager or DSM Center that includes a computer system and/or other hardware to assist in performing the required functions.

摘要翻译： DSL系统包括多环路段，其中K个环路被绑定以提供具有多达（2K-1）个通信信道的多环路段，在该通道上传输传输。 该段可以是到客户驻地，基座间链路或更大的DSL系统的任何其它适当部分的下降。 通常，粘结环相对短，为300米以下。 信号向量化用于提高通道的速度和数据承载能力。 在一些实施例中，扩展频谱也可以用于增加一个或多个信道的数据承载能力。 阻抗匹配电路可以耦合到段的每个端部，以提供跨越段的数据的有效传输。 控制器可以提供用于操作该段作为向量系统的控制信号，并且如果需要，可提供频率带宽控制信号。 控制器可以监视和/或从DSL系统收集数据和信息以帮助产生控制信号。 控制器可以是动态频谱管理器或DSM中心，其包括计算机系统和/或其他硬件以协助执行所需的功能。

公开(公告)号：US07573943B2

公开(公告)日：2009-08-11

申请号：US10922705

申请日：2004-08-20

申请人： John M. Cioffi

发明人： John M. Cioffi

IPC分类号： H04K1/10

CPC分类号： H04L25/10 ,  H04B1/126 ,  H04B3/32 ,  H04L27/2647 ,  H04M3/304 ,  H04M3/34

摘要： A DSL or other communication system includes a modem or other communication device having at least one antenna that is configured to collect interference data relating to interference noise affecting communication signals being received by the communication device. The interference may include RF interference, such as AM radio interference, crosstalk and other types of interference from various sources. The interference data collected by the antenna is used by an interference canceller to remove and/or cancel some or all of the interference affecting received signals. In some embodiments of the present invention, more than one antenna may be used, wherein each antenna can collect interference data pertaining to a single source of interference noise. Where a modem or other communication device is coupled to multiple telephone lines, only one of which is being used as the active DSL line, wires in the remaining telephone lines or loops can be used as antennas. Moreover, the antenna may be an antenna, per se, such as a compact AM radio antenna or any other suitable structure or device for collecting the type(s) of interference affecting signals received by the communication device.

摘要翻译： DSL或其他通信系统包括具有至少一个天线的调制解调器或其他通信设备，其被配置为收集与影响通信设备正在接收的通信信号的干扰噪声有关的干扰数据。 干扰可能包括RF干扰，如AM无线电干扰，串扰以及其他各种干扰源。 由天线收集的干扰数据由干扰消除器用于去除和/或消除影响接收信号的一些或全部干扰。 在本发明的一些实施例中，可以使用多于一个天线，其中每个天线可以收集属于单个干扰噪声源的干扰数据。 在调制解调器或其他通信设备耦合到多条电话线路的地方，其中只有一条正在用作有源DSL线路，其余电话线路或环路中的线路可用作天线。 此外，天线本身可以是诸如紧凑的AM无线电天线或用于收集影响由通信设备接收的信号的干扰类型的任何其它合适的结构或设备的天线。

公开(公告)号：US07079549B2

公开(公告)日：2006-07-18

申请号：US10051601

申请日：2002-01-17

申请人： John M. Cioffi ,  John A. C. Bingham ,  Krista S. Jacobsen

发明人： John M. Cioffi ,  John A. C. Bingham ,  Krista S. Jacobsen

IPC分类号： H04J1/02 ,  H04J3/06

CPC分类号： H04L1/0025 ,  H04L1/206 ,  H04L5/0007 ,  H04L5/0037 ,  H04L5/0048 ,  H04L5/0064 ,  H04L5/0091 ,  H04L5/023 ,  H04L27/2601 ,  H04L27/2608 ,  H04L2001/0093

摘要： A variety of bi-directional data transmission systems that facilitate communications between a plurality of remote units (15) and a central unit (10) using a frame based discrete multi-carrier transmission scheme are disclosed. In each of the systems, frames transmitted from the plurality of remote units (15) are synchronized at the central unit (10). A variety of novel modem arrangements and methods for coordinating communications between a plurality of remote units (15) and a central unit (10) to facilitate multi-point-to-point transmission are disclosed. The invention has application in a wide variety of data transmission schemes including Asymmetric Digital Subscriber Line systems that include the transmission of signals over twisted pair, fiber and/or hybrid telephone lines, cable systems that includes the transmission of signals over a coaxial cable, and digital cellular television systems that include the transmission of radio signals.

摘要翻译： 公开了使用基于帧的离散多载波传输方案来促进多个远程单元（15）和中央单元（10）之间的通信的各种双向数据传输系统。 在每个系统中，从多个远程单元（15）发送的帧在中央单元（10）处同步。 公开了用于协调多个远程单元（15）和中央单元（10）之间的通信以便于多点到点传输的各种新颖的调制解调器布置和方法。 本发明应用于各种各样的数据传输方案，包括非对称数字用户线路系统，包括通过双绞线，光纤和/或混合电话线路传输信号，包括通过同轴电缆传输信号的电缆系统，以及 包括无线电信号传输的数字蜂窝电视系统。

公开(公告)号：US07027537B1

公开(公告)日：2006-04-11

申请号：US09519727

申请日：2000-03-03

申请人： Kok-Wui Cheong ,  Won-Joon Choi ,  Johnny Li-Shung Fan ,  Zining Wu ,  John M. Cioffi

发明人： Kok-Wui Cheong ,  Won-Joon Choi ,  Johnny Li-Shung Fan ,  Zining Wu ,  John M. Cioffi

IPC分类号： H03D1/06 ,  H03D11/04 ,  H03K5/01 ,  H03K6/04 ,  H04B1/10

CPC分类号： H04L1/005 ,  H04B1/1036 ,  H04L1/0048 ,  H04L1/0057 ,  H04L1/0071 ,  H04L7/0062 ,  H04L25/0202 ,  H04L27/2647 ,  H04L2025/03414

摘要： Methods and mechanisms for reducing the impact of cross talk interference in multi-carrier data transmission systems are disclosed. In one aspect, the invention relates to a method of canceling cross talk interference in a received data signal. The method includes receiving an input signal that includes a primary data signal and a superimposed cross-talk signal. An estimation of the primary data signal and an estimation of the superimposed cross talk signal are iteratively computed. The probable estimation of the primary data signal is based at least in part upon the iteratively computed probable estimation of the cross talk signal and the probable estimation of the superimposed cross talk signal is based at least in part upon the iteratively computed probable estimation of the primary data signal.

摘要翻译： 公开了减少多载波数据传输系统中串扰干扰的影响的方法和机制。 一方面，本发明涉及一种消除接收数据信号中串扰干扰的方法。 该方法包括接收包括主数据信号和叠加的串扰信号的输入信号。 迭代地计算主数据信号的估计和叠加串扰信号的估计。 主要数据信号的可能估计至少部分地基于迭代计算的串扰信号的可能估计，并且叠加串扰信号的可能估计至少部分地基于迭代计算的主要数据信号的可能估计 数据信号。